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Document and Entity Information
Dec. 14, 2025
Cover [Abstract]  
Security Exchange Name NASDAQ
Amendment Flag false
Entity Central Index Key 0000933972
Document Type 8-K
Document Period End Date Dec. 14, 2025
Entity Registrant Name 374WATER INC.
Entity Incorporation State Country Code DE
Entity File Number 000-27866
Entity Tax Identification Number 88-0271109
Entity Address, Address Line One 100 Southcenter Court
Entity Address, Address Line Two Suite 200
Entity Address, City or Town Morrisville
Entity Address, State or Province NC
Entity Address, Postal Zip Code 27560
City Area Code (440)
Local Phone Number 601-9677
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.0001
Trading Symbol SCWO
Entity Emerging Growth Company false